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Please find the unknown with all steps ​

Please find the unknown with all steps ​-example-1
User Janjust
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1 Answer

2 votes

Answer:

see explanation

Explanation:

Since AC = BC then ΔABC is isosceles with base angles

∠BAC =∠ABC, thus

3x + x = 70

4x = 70 ( divide both sides by 4 )

x = 17.5

----------------------------------------------------

∠ADC is an external angle of ΔABD and the external angle is equal to the 2 opposite interior angles, hence

y = 70 + x = 70 + 17.5 = 87.5

User Ram Mandal
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